I was working through the book and got to chapter through chapter 4 ok. Now I cannot see my video or here sound. When I hit play, the line moves and counts, but no video. The picture in the Bin is a file with two circular arrows. If I open my own video I can see and here it.
don't know which book you are refering to, but it looks like you have to releink your media: select, rightclick and promt it to the location of your video file.
Edit: sorry, i guess it was a wrong hint. Maybe you can upload a screenshoot?